Adjustable scaling hammer



Nov. 26, 1957 2,814,093

M. O. HULVEY ADJUSTABLE SCALING HAMMER Filed April 9, 1957 INVENTOR ATTORNEYS United States Patent ADJUSTABLE SCALING HAMMER Marvin 0. Hulvey, Harrisonburg, Va. Application April 9, 1957, Serial No. 651,683

3 Claims. (CI. 29-81) matter which must be removed from the work surface.

Such hammers are provided with a chisel-shaped scaling blade at one end of the hammer head which is provided with a wedge-shaped edge extending perpendicular to the axis of the hammer handle. However, when welders are required to perform the scaling operation in corners or along the bases of walls and like locations, it is frequently difficult or impossible to so direct the arc of movement of the hammer head in approaching the work so as to avoid striking the adjacent wall surfaces with either the scaling blade or the hand of the user.

An object of the present invention is the provision of a scaling hammer for use by welders and the like, which is provided with a scaling blade portion having a chiselshaped end which may be oriented to various positions of adjustment relative to the axis of the head to facilitate scaling operations in corners or other restricted areas.

Another object of the present invention is the provision of a chipping hammer for Welders and the like having an adjustable chisel-shaped scaling blade terminating in a wedge-shaped point which may be readily oriented to any of a wide selection of orientations relative to the axis of the hammer head.

Another object of the present invention is the provision of a novel scaling hammer for welders and the like having an adjustable scaling blade terminating in a chisel point which is coupled to the hammer head by a novel spring-loaded clutch mechanism permitting a wide variety of angular adjustments of the chisel point, which clutch mechanism is capable of withstanding the severe stresses to which such impact tools are subjected over a long period of use.

Other objects, advantages and capabilities of the present invention will become apparent from the following detail description, taken in conjunction with the accompanying drawing showing one preferred embodiment of the invention.

In the drawing:

Figure l is a side elevation of a scaling hammer embodying the present invention;

Figure 2 is a fragmentary section view of the scaling blade and associated parts of the hammer, taken along the line 2-2 of Figure 1;

Figure 3 is a transverse section view taken along the line 3-3 of Figure 2; and

Figure 4 is a transverse section view taken along the line 44 of Figure 2.

Referring to the drawing, wherein like reference characters designate the corresponding parts throughout the several figures, the scaling hammer of the present invention, generally indicated by the reference character 10, comprises a handle 11 of conventional construction, prefice erably formed of wood, one end of which is secured by conventional wedges or other securing techniques to the hammer head 12, the end of the handle 11 being received in the conventional eye 13 formed in the medial portion 14 of the hammer head 12. Extending from one end of the medial portion 14 of the hammer head and formed integral therewith is the usual peen 15. -A chisel-shaped scaling unit 16 terminating in a wedge-shaped point 17 and having a tapered neck portion 18 extending rearwardly from the cutting edge is adjustably and removably secured to the medial portion 14 of the head 12 by a springloaded clutch mechanism, indicated generally by the reference character 19.

The rearmost end of the chisel-shaped scaling unit 16 terminates in a flat annular shoulder 20 which lies in a plane perpendicular to the axis of the scaling unit 16 and surrounds an annular socket 21 having a serrated outer bounding surface 22 formed with a large number of valleys of triangular cross section extending parallel to the axis of the socket 21. A stub shaft 23 integrally formed with. the scaling unit projects rearwardly from the base of the socket 21 and is axially aligned with the scaling unit 16. The stub shaft 23 is adapted to loosely receive thereon an externally threaded bushing 24 which is loosely fitted over the stub shaft 23, a coil spring 25, a retaining washer 26, and a split locking key or cotter pin 27. Pin 27 is projected through a complementary transverse aperture in the stub shaft 23 adjacent the end of the stub shaft to retain the bushing 24, spring 25 and washer 26 on the stub shaft. The adjacent end of the medial portion 14 of the chipping hammer surrounds an outwardly projecting, internally threaded collar 29 which is integral with the medial portion 14 of the hammer head 12. The internally threaded surface thereof bounding the entrance portion of a bore 30 extends inwardly of the medial head portion 14 and is designed to accommodate the stub shaft and components supported thereon. This internally threaded projecting collar 29 is provided with a polygonal surface such as a hexagonal surface 31, as shown in Figure 3, or a surface of any desired number of flat faces extending in planes paralleling the axis of the medial head portion 14, forming a number of angular corners 32 adapted to register with some of the V-shaped valleys forming the serrated outer bounding surface 22 of the socket 21 so as to frictionally restrain the chisel-shaped scaling unit 16 in desired positions of adjustment relative to the axis of the hammer head 12. Also, the threaded bushing 24 preferably terminates in a hexagonal or other polygonal surface portion 24 which duplicates in form and size the collar surface 31.

In order to assemble the components of the scaling unit 16 together, the externally threaded bushing is slipped over the upper end of the stub shaft 23 and the coil spring 25 and washer 26 are successively fitted over the stub shaft. The split locking key or cotter pin 27 is then inserted through the complementary opening thereof in the stub shaft 23 and is peened or bent over into locking position. The upper end of the stub shaft 23 is then inserted into the bore 30 of the medial head portion 14 and the bushing 24 is threaded into the internally threaded surface of the collar 29 forming the entrance to the bore 30. The stub shaft 23 is formed with a transverse opening 33 intermediate the ends thereof at a suitable location to permit a pin or other instrument to be inserted therein while the bushing 24 is positioned toward the free end of the shaft 23 and the spring 25 is compressed to hold the bushing in an exposed position where it can be started into the threaded collar 29. The pin or instrument can then be removed from the opening 23 and the scaling unit 16 held in a position wherein the hexagonal portion 24' of the bushing, but not the hexagonal surface 31 of the collar, is seated in the valleys V 3 of the serrated surface 22. Rotation of the scaling unit 16 will then effect full threading of the bushing 24 into the threaded collar 29.

When the bushing 24. is then fully threaded into the collar 29, the scaling unit 16 is released to permit it to be shifted to the position illustrated in Figure 2 under the influence of the spring 25 wherein the free end of the stub shaft 23 is projected fully into the bore 30. The

' corners 32 of the hexagonal surface 31 will then register with a group of the valleys formed by the serrated surface 22 to frictionally restrain the chisel-shaped scaling unit 16 at a selected position of orientation relative to the axis of the hammer head 12. When it is desired to readjust the orientation of the scale unit 16, the operator need only grasp the unit 16 and draw it outwardly of the hammer head 12 against the bias of the spring 25 until the serrated surface 22 of the sacket 21 is drawn clear of the hexagonal surface 31 of the collar 29, whereupon the unit is free to be rotated to the desired new angular position in which it will be retained upon release of the scaling unit 16.

While only one preferred embodiment of the inven tion has been particularly shown and described, it is apparent that other modifications may be made in the invention without departing from the spirit and scope thereof, and it is desired, therefore, that only such limitations shall be placed thereon as are imposed by the prior art and are set forth in the appended claims.

I claim:

1. A scaling hammer for cleaning welds and the like, comprising a handle, a head fixed to one end of the handle in perpendicular relation thereto, said head having a peen on one end thereof, a scaling tool member projecting from the other end of said head in axial alignment with the head and having a wedge-shaped cutting edge in the projected end thereof extending transversely of the axis of the head, and a spring-loaded clutch mechanism interconnecting said scaling tool member with said head to accommodate reciprocating movement of said tool member relative to said head and rotary movement of said tool member relative to the axis of said head when said tool member is withdrawn a selected distance from said head, said clutch mechanism having spring means continuously urging said tool member toward said head, and means holding said tool member against rotation when the latter is positioned immediately adjacent said head.

2. A scaling hammer for cleaning welds and the like, comprising an elongated handle, an elongated head fixed to one end of said handle in perpendicular relation to the axis of the handle, said head having a peen at one end thereof and a clutch formation at the other end thereof, an elongated scaling tool projecting from said clutch end of said head in axial alignment with the axis of said head and having a wedge-shaped cutting edge at the end thereof remote from said head, means supporting said scaling tool for reciprocative axial movement relative to said head, spring means continuously urging said scaling tool toward said head, and said clutch formation including coacting irregular surfaces on said head and said scaling tool disposed generally concentric with the axes of said head and said tool, said coacting surfaces being operative to restrain said tool and said head against relative rotation about their axes when said tool is positioned immediately adjacent said head by said spring means and being uncoupled from each other upon selected axial movement of said tool away from said head to release said head for rotation to other selected angular positions relative to said head.

3. A scaling hammer for cleaning welds and the like, comprising an elongated handle, an elongated head fixed to one end of the handle in perpendicular relation to the axis of the handle, said head having a peen at one end thereof and a bore at the other end thereof, an internally threaded collar integral with said head surrounding the entrance to said bore and having a polygonal surface defining a plurality of angular formations paralleling and spaced equally from the axis of said head, an elongated scaling tool extending in coaxial relation with the axis of said head from said other end having a wedgeshaped cutting edge at one end thereof remote from said head and a bore at the other end thereof for accommodating said collar, a stub shaft projecting axially from said scaling tool into said bore, a threaded bushing loosely surrounding'said stub shaft and threaded into said collar, spring means surrounding said stub shaft and disposed within said bore for continuously urging said scaling tool toward said collar and the adjacent end of said head, and said bore in said scaling tool having valleys formed in the surface thereof extending along axes paralleling the axis of said tool adapted to interfit with said angular formations on said collar for restraining said tool against rotation relative to said collar, whereby said tool may be shifted axially away from said head against the bias of said spring means to decouple said valleys from said angular formations and free said head for rotation to selected angular positions relative to said head and said scaling tool is returned by said spring toward said head upon release of said tool to interfit said angular formations in said valleys and restrain said scaling tool against rotation.

No references cited. 

